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Mean = (0 + 10 + 15 + 4 + 70 + 15 + 18 + 20 + 6 + 8 + 10 + 12 + 15 + 18 + 20 + 2 + 50 + 40 + 10) / 19
Mean = 383 / 19
Mean = 20.16
Therefore, the mean number of hours spent outside for the kids she surveyed is 20.16 hours.